2 metres long string有这样说的吗?

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2metreslongstring有这样说的吗?2metreslongstring有这样说的吗?2metreslongstring有这样说的吗?是two-metre-longstringtwo-met

2 metres long string有这样说的吗?
2 metres long string有这样说的吗?

2 metres long string有这样说的吗?
是 two-metre-long string
two-metre-long 是形容词.
三个单词要用连接符连起来,metre 要用单数
也可以这样说:a string that is 2 metres long